:root {
    /* Colors */
    --color-primary: #1E40AF;
    --color-secondary: #60A5FA;
    --color-background: #F0F4F8;
    --color-footer-bg: #1F2937;
    --color-button: #1E40AF;
    --color-text-light: #F8FBFF;
    --color-text-dark: #1F2937;
    --color-section-bg-1: #E1E7EF;
    --color-section-bg-2: #F8FBFF;
    --color-section-bg-3: #D4DDE8;
    --color-section-bg-4: #BFC9D7;

    /* Typography */
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Roboto', sans-serif;
    --font-size-base: 1rem; /* 16px */
    --line-height-base: 1.7;
    --line-height-heading: 1.2;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;

    /* Shadows */
    --shadow-subtle: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.02);
    --shadow-hover: 0 8px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-speed: 0.3s;
    --transition-ease: ease-in-out;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text-dark);
    background-color: var(--color-background);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: var(--line-height-heading);
    color: var(--color-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em; /* Subtle tightening for headings */
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    font-weight: 600;
}

h3 {
    font-size: 1.8rem;
    font-weight: 600;
}

h4 {
    font-size: 1.4rem;
    font-weight: 500;
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-speed) var(--transition-ease);
}

a:hover {
    color: var(--color-secondary);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
}

/* Layout & Structure */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

main {
    flex-grow: 1;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-footer-bg); /* Dark blue background */
    color: var(--color-text-light); /* Light grey text */
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-subtle);
    z-index: 1000;
    transition: background-color var(--transition-speed) var(--transition-ease);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-lg);
}

.header .logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-text-light);
    text-decoration: none;
}

.header nav a {
    color: var(--color-text-light);
    margin-left: var(--spacing-lg);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px; /* Space for underline effect */
}

.header nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width var(--transition-speed) var(--transition-ease);
}

.header nav a:hover::after,
.header nav a.active::after {
    width: 100%;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-button);
    color: var(--color-text-light);
    border: none;
    border-radius: var(--border-radius-lg); /* Slightly rounded corners */
    font-family: var(--font-heading);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color var(--transition-speed) var(--transition-ease),
                transform var(--transition-speed) var(--transition-ease),
                box-shadow var(--transition-speed) var(--transition-ease);
    box-shadow: var(--shadow-subtle);
    letter-spacing: 0.05em;
}

.btn:hover {
    background-color: color-mix(in srgb, var(--color-button) 90%, black); /* Darken background */
    transform: translateY(-2px) scale(1.01); /* Slight scale and lift */
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-text-light);
}

.btn-secondary:hover {
    background-color: color-mix(in srgb, var(--color-secondary) 90%, black);
}


/* Section Backgrounds */
.section-bg-1 {
    background-color: var(--color-section-bg-1);
}

.section-bg-2 {
    background-color: var(--color-section-bg-2);
}

.section-bg-3 {
    background-color: var(--color-section-bg-3);
}

.section-bg-4 {
    background-color: var(--color-section-bg-4);
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-subtle);
    filter: saturate(0.9) brightness(1.05); /* Slightly muted, professional palette */
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text-dark);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-section-bg-3);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    color: var(--color-text-dark);
    background-color: var(--color-background);
    transition: border-color var(--transition-speed) var(--transition-ease),
                box-shadow var(--transition-speed) var(--transition-ease);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    border-color: var(--color-secondary);
    outline: none;
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-secondary) 30%, transparent); /* Subtle focus ring */
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-validation-error {
    color: #ef4444; /* Subtle red for error */
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.form-validation-success {
    color: #22c55e; /* Subtle green for success */
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* Footer */
.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-section-bg-3);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xxl);
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-lg);
}

.footer-section {
    flex: 1;
    min-width: 200px;
    margin-bottom: var(--spacing-md);
}

.footer-section h4 {
    color: var(--color-text-light);
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.footer-section p,
.footer-section ul,
.footer-section li {
    font-size: 0.95rem;
    color: var(--color-section-bg-4);
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li a {
    color: var(--color-section-bg-4);
    transition: color var(--transition-speed) var(--transition-ease);
    display: inline-block;
    padding: 2px 0;
}

.footer-section ul li a:hover {
    color: var(--color-secondary);
    transform: translateX(3px); /* Subtle shift on hover */
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid color-mix(in srgb, var(--color-footer-bg) 70%, var(--color-section-bg-4));
    margin-top: var(--spacing-lg);
    font-size: 0.85rem;
    color: var(--color-section-bg-4);
}

/* Utility classes for spacing */
.py-section {
    padding-top: var(--spacing-xxl);
    padding-bottom: var(--spacing-xxl);
}

.mb-section {
    margin-bottom: var(--spacing-xxl);
}

/* Animations and Effects */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--transition-ease), transform 0.6s var(--transition-ease);
}

.fade-in-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .header nav {
        margin-top: var(--spacing-md);
        width: 100%;
        text-align: center;
    }

    .header nav a {
        margin: 0 var(--spacing-sm) var(--spacing-xs) 0;
        display: inline-block;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-section {
        min-width: unset;
        width: 100%;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.7rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .btn {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
    }
}


/* Cookie Banner Additional Styles for Tailwind */
.cookie-banner-hover-effect:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

@media (prefers-reduced-motion: reduce) {
    .cookie-banner-hover-effect:hover {
        transform: none;
    }
}